Automated Fiber Placement of Thin-Ply Composite Materials for Large Aerospace Structures

Leveraging their prior experience working with automated fiber placement (AFP) of thin-ply composite materials, NextGen Materials & Processing LLC and the University of Massachusetts Lowell will utilize a Design of Experiments approach, combined with analytical modeling, to identify the critical material, slitting, spooling, and AFP parameters that influence the repeatable, high quality laydown of thin-ply composite materials to produce large aerospace structures. To date, long and costly certification processes have hindered the widespread adoption and exploitation of the benefits of thin-ply composites with AFP. Without critical end-user feedback, material manufacturers haven’t fully developed their thin-ply material systems with the same repeatability, consistency, and quality of standard-ply-thickness composites. Thus, further process development is necessary to optimize thin-ply unidirectional tapes for AFP. Working closely with Hexcel, the NextGen/UMass Lowell team will develop AFP-optimized conditions for a thin-ply version of the IM7 carbon fiber/8552-1 epoxy prepreg system, independent of different types of AFP machines. Using this material in conjunction with AFP, mechanical test coupons will be fabricated and tested to produce data for contribution to the development of the design and qualification database for thin-ply composite materials that will accelerate the adoption of these materials in structural applications.